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Author: parz1val37

Permutation.py

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+print("Permutations of 'n' distinct objects taken 'r' at a time is given by:\nnPr = n!/(n-r)!, where \"!\" denotes the factorial.\n")
+
+
+try:
+    n = int(input("Enter the value of n (n>0): "))
+    if n>0:
+        r = int(input("Enter the value of r (r>=0): "))
+    elif n<=0:
+        print("Enter a valid input")
+        exit()
+
+    def factorial(x):
+        if x==0 or x==1:
+            return 1
+        else:
+            return x*factorial(x-1)
+
+    ans = (factorial(n))/(factorial(n-r))
+    print(f"\nPermutation of {n} distinct objects taken {r} at a time is: {int(ans)}")
+
+except Exception as e:
+    print(f"ERROR: {e}")